Malicious PDF — malware analysis report

Static analysis result for SHA-256 c267634f80244ce7…

MALICIOUS

PDF

78.1 KB Created: 2021-08-24 22:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 20c293d08a9162b4f2780f880c5648cc SHA-1: b707dac3d2d4758a9c76a9f3a6f2fbe18ea23e8e SHA-256: c267634f80244ce7c1057630b7753966c9893e0fb6f8bdcb0010879a009c57d0
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which appear to be compromised WordPress installations. The ML classifier flagged this PDF as malicious, and the presence of multiple links to potentially malicious or SEO-manipulated content suggests an attempt to redirect users to harmful sites. No scripts were extracted, but the structure indicates a malicious intent to leverage external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7969

Heuristics 4

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.casasemio.com.br/ckfinder/userfiles/files/bokopanotitabutafesipow.pdf In PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d67ede463c7ba5a90781e293e97cb2dc/gofolemejugekijijelagip.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59dffa53f4---zomupasefa.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/2903961036b5bdc8c1d1d0b81007f306/zinufir.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/60595025929.pdfIn PDF document text
    • http://rhondachem.com/d/files/89022248169.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6c9930e6c---minutiwipukonot.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/96291965499.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/j0epmq6e5nd1qlldp3tsv19o13/79039256399.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160799f2c72534---fejotuwuwutivoxoguwufu.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080999813861---54026598621.pdfIn PDF document text
    • http://padgettlawreunion.com/clients/79772/File/rajogesuwazabevop.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/981e924a8c23b666f07aa7a650f4318a/fodifugezabadimijo.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7c6568a86d---57866243793.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610383887db44---gogipej.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/a354f627eb0115ee524e36e5ea52192b/kapazodidufelipufal.pdfIn PDF document text
    • http://metallpress.ru/files/65781615141.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/af0ee250302314eca2d62e2bf6f666fd/nixugobusekixivejeweki.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/80050594152.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/e4ec8517b761e8902f3c92b98164096c/pafanuvaku.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/9dd1e634f3d6629deedac60d965ffd11/pekiwawiwimituvapejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=lesson+20+vocabulary+answersPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD201 19816 bytes
SHA-256: 3c63390a0bccad1b740b2700208ec2e94e89b9c56dce17c66b0e0609b8eb3067
font_01_sfnt_off0001032f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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